ANSICHTSKARTE Dodel-Port, Arnold Author: Dodel-Port, Arnold Recipient: Haeckel, Ernst Dating: 16.03.1903
ANSICHTSKARTE Bariffi, Antonio; Bariffi, Clelia, geb. Bertschy Author: Bariffi, Antonio; Bariffi, Clelia, geb. Bertschy Recipient: Haeckel, Ernst Dating: 15.11.1914